Free Billy! reports that "At least 13 elephants have died at LA Zoo since 1975. More than half did not live to age 20. Elephants have a natural lifespan of 60-70 years."

Billy is a 23-year-old Asian elephant that is suffering so severely from his confinement that he exhibits the neurotic behaviors of head bobbing and swaying--actions that are not seen in elephants in their natural habitat. You can watch a clip of this below.